Pro-Russian protesters travel in a truck in Kramatorsk, in eastern Ukraine April 16, 2014. Fifteen armoured troop carriers full of paratroopers were surrounded and halted by a pro-Russian crowd at a town near an airbase. They were allowed to retreat only after the soldiers handed the firing pins from their rifles to a rebel commander. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)

Pro-Russian protesters travel in a truck in Kramatorsk, in eastern Ukraine April 16, 2014. Fifteen armoured troop carriers full of paratroopers were surrounded and halted by a pro-Russian crowd at a town near an airbase. They were allowed to retreat only after the soldiers handed the firing pins from their rifles to a rebel commander. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)